behind to fight a rearguard action. PAVN artillery from north of the DMZ answered the American supporting arms with a 400-round barrage of its own on the Marines. Marine casualties were two KIA and nine wounded for 83 PAVN killed. For the entire month in Operation Kentucky, 9th Marines reported over 400 enemy dead while Marine casualties were 37 KIA and more than 200 wounded. On 22 May a patrol from Company A 1/4 Marines ran into a PAVN force east of Con Thien. 1/4 Marines attacked east from Con Thien, while 3/3 Marines attacked west from Strongpoint A-3. 3/9 Marines were helicoptered into blocking positions in the south, while 1/9 Marines was helicoptered into blocking positions in the north. The PAVN tried to escape across the trace line but were mowed down by artillery, tank, gunship and fixed-wing fire. The PAVN suffered 225 killed, while the Marines had 23 KIA and 75 wounded. On 6 June, a reinforced platoon from Company E, 26th Marines observed and then engaged a PAVN company while on patrol 1.8 km southeast of Con Thien. Reinforced by the command group and a rifle platoon from Company H, the patrol engaged the PAVN with small arms and 81mm mortars. 14 PAVN were killed and the Marines suffered 14 killed and 11 wounded. On 7 July, to exploit the results of Operation Thor in the Cua Viet-Dong Ha sector, the 9th Marines began a sweep of the area between Con Thien and the DMZ. On 11 July 4 km northeast of Con Thien, elements of 3/9 Marines discovered a reinforced PAVN platoon in the open. Fixing the PAVN in place with small arms fire, the Marines, with air, artillery, and tank support, launched a coordinated air-ground attack through the area killing more than 30 PAVN. The 9th Marines uncovered and destroyed numerous PAVN fortifications, a few of the positions were lightly defended, but the majority were abandoned. One bunker system discovered 4 km due north of Con Thien spanned more than 1 km and included 242 well-constructed bunkers. Supplies and equipment abandoned included weapons, 935 mortar rounds, 500 pounds of explosives, 55 antitank mines, and 500 pounds of rice. The Marines also found 29 NVA bodies, killed by artillery and airstrikes during the advance on the complex. On 21 July 2/9 Marines discovered a major PAVN bunker complex 6 km southwest of Con Thien. Composed of